JP4926883B2 - Method for providing material information of shipped steel plate and method for using material information of shipped steel plate - Google Patents

Description

  The present invention relates to a material information providing method for a shipped steel sheet and a method for using the same, and more specifically, predicts the material in the width direction of the steel sheet from the rolling results of the temper rolling mill for the steel sheet, and the result is obtained via a computer and a network. The present invention relates to a method provided to a user and a method of using the information.

  A steel plate manufacturer provides a user with material test results of a part of a steel plate that has been shipped in the past as material information. However, with respect to the width direction of the steel plate, only one center part of the steel plate or about three points on the center and both sides are subjected to a material test for the number of samples.

On the other hand, as for quality information such as steel plate defects, there is a disclosure of a system that provides the user with electronic information via a computer as information on the longitudinal direction of the steel sheet including images, as in Patent Document 1, for example.
JP 2003-215052 A

  However, since the steel plate material information is usually obtained by taking a steel plate sample and conducting a material test with an off-line material testing machine, only the material result of the sample collection portion which is a part of the shipped steel plate can be obtained. If it is going to increase the material information of a shipped steel plate, many samples for a material test must be taken, For this reason, a steel plate is divided | segmented into pieces and it becomes impossible to satisfy | fill the predetermined shipment weight designated by the user. Even if a large number of steel plate samples are collected, the material test takes a lot of time and labor, which is not realistic. Furthermore, when the material test value in the width direction is reached, the number of measurement points and work additions increase in multiples as much as required in the width direction.

  On the other hand, quality information such as surface flaws of steel sheets is detected by a surface flaw detection device installed on the steel sheet production line, and even parts or total lengths other than the steel plate sample collection position can be aggregated by a computer and provided to users via a network. The material values such as yield strength and tensile strength were not feasible because there was no means for measuring the material values other than taking a steel plate sample and conducting a material test.

  In addition, some r-value detectors based on non-destructive magnetic flux density measurement were installed in the steel plate production line, but adjustment was required for each type of soft steel plate, high strength steel plate, etc. Only the value could be measured and there was no versatility.

  The present invention solves the above-described problems, obtains material data over the entire length of the shipped steel plate without taking time and labor, and obtains a large amount of material information via a computer and a network. It provides to the user and provides a method to be used by the user. Another object of the present invention is to provide a method of using material information of a shipped steel sheet that feeds back information on the material of the steel sheet from the user to the steel sheet manufacturer and improves the productivity of the steel sheet production line.

  As a result of intensive studies to solve the above-mentioned problems, the present invention arranges a temper rolling mill equipped with a continuous roll or a backup roll divided in the steel sheet width direction on the outlet side of the galvanizing equipment, Focusing on the fact that material prediction in the width direction of the steel sheet can be accurately performed based on the rolling results in the temper rolling mill, and found that if the prediction data can be used effectively, more material data can be provided to the user. It has been done.

  The material information providing method of the shipped steel sheet using the method of predicting the width direction material of the tempered rolled steel sheet according to claim 1 made based on the above knowledge includes a plurality of the steel sheet width direction on the outlet side of the continuous annealing line or the galvanizing equipment. A temper rolling mill equipped with a backup roll divided into two is placed, and the material prediction in the width direction of the temper rolled steel sheet is performed based on the rolling results in this temper rolling mill, and the obtained material prediction result is displayed as a higher-level computer. In addition, it is provided to a user of a steel plate shipping destination via a network.

  According to a second aspect of the present invention, in the first aspect of the invention, a temper rolling mill equipped with a backup roll divided into a plurality of widths in the steel sheet width direction is disposed on the outlet side of the continuous annealing line or the galvanizing equipment. Measure the elongation rate, tension, rolling load value and thickness and width of the steel sheet in the temper rolling mill or obtain it from the host computer. Based on these values, perform material prediction in the width direction of the temper rolled steel sheet. The obtained material prediction result is provided to the user of the shipping destination of the steel sheet via a computer and a network.

  In the invention of claim 3, the values of the elongation, tension and rolling load, and the thickness and width of the steel plate are continuously measured over the entire length of the steel plate or obtained from a host computer, and adjusted based on these values. It is characterized by predicting the material in the width direction of the entire length of the quality rolled steel sheet and providing the obtained width direction material prediction result to the user of the ship destination of the steel sheet via a computer and a network.

  In addition, as in claim 4, the material prediction in the width direction of the temper rolled steel sheet is calculated, and the yield point of the steel sheet is calculated from the values of elongation rate, tension and rolling load in the temper rolling mill, and the plate thickness and width of the steel plate. It is preferable to carry out using the prediction formula.

The invention of the material information utilization method of the shipped steel sheet according to claim 5 is characterized in that the user removes the defective material portion by the material information obtained by the material information providing method according to any one of claims 2 to 4. To do.

Further, the invention of the material information utilization method of the shipped steel sheet according to claim 6 is that the user changes the pressing condition of the steel sheet by the width direction material information obtained by the material information providing method according to any one of claims 2 to 4. It is characterized by this.

  Further, the invention of the method for using material information of the shipped steel sheet according to claim 7 is the invention according to claim 5, wherein the user removes the material condition and the information about the part of the steel sheet, which are removed as material defects, to the steel sheet manufacturer via a computer and a network. It is characterized by doing.

  The invention of claim 8 is characterized in that, in the invention of claim 6, the material condition and the information on the part of the steel sheet changed by the user in the press condition of the steel sheet are fed back to the steel sheet manufacturer via a computer and a network. Is.

  According to the present invention, the steel plate manufacturer can provide the user with a large amount of width direction material data of the shipped steel plate or the width direction material data over the entire length, and the user can use this material information to remove the defective portion of the steel plate. By changing the pressing conditions of the steel sheet, it is possible to prevent the occurrence of defective products in the production line. Furthermore, the user can feed back to the steel plate manufacturer information on the material conditions removed as a material defect and the part of the steel plate. Thus, by sharing the steel plate material information between the steel plate manufacturer and the user, it becomes possible to increase the productivity of both, and its significance is extremely great.

  One of the major features of the present invention is that a temper rolling mill equipped with a backup roll divided into a plurality of steel sheets in the width direction is arranged on the outlet side of a continuous annealing line or galvanizing equipment, and rolling in the temper rolling mill It is to predict the material in the width direction of the tempered rolled steel sheet based on the actual results, and to provide the obtained material result of the width direction material as the material value of the shipping steel sheet to the user at the shipping destination of the steel sheet via the host computer and the network . Of course, the result of a material test using a steel sheet sample taken from a part of the shipped steel sheet as usual is also attached to the form of the shipped steel sheet.

  However, the present invention is characterized in that it is possible to cut the material value in the width direction, which is accurate despite the predicted value, by providing it to the user at the shipping destination even in the portion other than the collected steel plate sample. In the width direction material prediction, the material prediction of the temper rolled steel sheet is performed based on the rolling results in the temper rolling mill arranged on the outlet side of the continuous annealing line or the galvanizing equipment.

  First of all, regarding the material prediction method, refer to the drawing with an example of a temper rolling mill equipped with a backup roll divided in the width direction of the steel plate installed on the exit side of the continuous annealing line or the exit side of the galvanizing equipment. However, a preferred embodiment of the present invention will be described. In the case of a galvanizing facility, it may be considered that there is a galvanizing facility between an annealing furnace and a temper rolling mill, and the case of a continuous annealing furnace line will be described as an example.

  FIG. 1 is a diagram schematically showing a continuous annealing line of a steel sheet, wherein 1 is a continuous annealing furnace, and 2 is a temper rolling mill arranged on the outlet side thereof. The continuous annealing furnace 1 is roughly divided into a heating furnace 3, a primary soaking furnace 4, a secondary soaking furnace 5, and a cooling furnace 6. The steel sheet delivered from the delivery reel 7 is heated and annealed to a temperature suitable for the material of the steel sheet while traveling in the heating furnace 3, the primary soaking furnace 4, and the secondary soaking furnace 5 in sequence. The material is quenched in the cooling furnace 6 from the outlet temperature of the next soaking furnace 5, temper-rolled by the temper rolling mill 2, and wound on the take-up reel 8. In addition, surface treatment equipment such as an overaging furnace, a cooling furnace, a hot dipping equipment for manufacturing surface-treated steel sheets, an alloying equipment, and an electroplating equipment is attached between the cooling furnace 6 and the temper rolling mill 2. Also good. The above configuration is not different from the conventional one, and the plate temperature of each part is controlled with high accuracy as described above.

  In the temper rolling mill 2, temper rolling is performed by light reduction. In the present invention, as shown in FIG. 2, the temper rolling is equipped with a backup roll 9 divided into a plurality in the width direction of the steel sheet. A temper rolling mill 2 equipped with a machine 9 is used. The divided backup roll 9 is provided with a rolling load meter 10, and the rolling load when the work roll 11 temper-rolls the steel sheet is measured at a plurality of points in the width direction of the steel sheet.

  In FIG. 2, the number of divisions of the backup roll 9 is 5, but the number of divisions can be increased. The total tension value can be measured by the tension meter roll 12, and the thickness and width of the temper rolled steel sheet are measured by the thickness gauge 13 and the width gauge 14 installed on the exit side of the temper rolling mill 2. it can. The rolling tension uses a value per unit cross-sectional area obtained by dividing the total tension value by the plate thickness and the plate width.

  In the present invention, in order to accurately predict the material in the width direction of the steel sheet, not only the tension and elongation rate of the temper rolling mill 2 but also the rolling load in the width direction of the steel sheet of the temper rolling mill 2 is used for the material prediction. 3 and 4 show the correlation between the rolling load and the yield point of the high-tensile steel plate in the case of the high-tensile steel plate. That is, according to the results data, as shown in FIGS. 3 and 4, if the elongation is the same, the yield point (YP) of the steel sheet increases as the rolling load and tension increase, and FIGS. As shown, the tensile strength (TS) is also increasing. Even if the rolling load or tension is constant, the yield point (YP) and the tensile strength (TS) increase as the elongation rate is lower. From this, it can be seen that there is a strong correlation between the rolling load, tension, elongation, and material (YP, TS) of the temper rolled steel sheet.

Therefore, based on past operational results, a material prediction formula for temper rolled steel sheet was created. The ROBERTS formula, known as the theoretical formula for temper rolling, includes many influential factors such as material (YP, TS), elongation, tension, friction coefficient, thickness, rolling speed, roll diameter, etc. Since the material can be accurately predicted by using the above factor with high accuracy, the following material prediction formula was created as an example of the present invention. The influential factors are calculated from the elongation (%) of the temper rolling mill, the tension (MPa) of the temper rolling mill, the sheet thickness (mm), the rolling load of the temper rolling mill and the sheet width of the steel sheet. Line load (ton / m) is used.
YP = a * Elongation rate (%) + b * (Average tension MPa) + c * (Steel sheet thickness mm * Line load ton / m) + d

  In this equation, YP is the yield point, the unit is MPa, SPM% is the elongation rate, and the line load is a value obtained by dividing the rolling load by the width of the steel sheet. The coefficients included in this equation are determined by multiple regression analysis, but the specific numerical values of a, b, c, and d in the above equation and the form of the equation are determined by the characteristics of each line and the strength of the steel plate to be passed Needless to say, the present invention is not limited to the above.

  By the way, when temper rolling with a constant rolling load, which is often performed on mild steel sheets, is performed on high-tensile steel sheets with a strength of 780 MPa or more, for example, the steel sheet's high tension causes an excessive rolling load and tension balance close to the limit of equipment specifications. The temper rolling may become extremely unstable, and the rolling itself may become extremely unstable, and in the worst case, troubles such as plate breakage may occur.

  As for the above tension, in actual operation, there is a tension on the entry side and the exit side of the temper rolling mill, but both are in a proportional relationship, and the values used for material prediction use the entry side or the exit side, but both are averaged. It is preferable to use it. As for the thickness and width of the steel sheet, either the value on the entry side or the value on the exit side of the temper rolling mill may be measured or obtained from the host computer, and the steel sheet in the annealing furnace may be used. It is preferable to use the value on the outlet side of the temper rolling mill from the influence of the elongation of the steel.

  The reason why TS can be predicted extremely accurately as will be described later when the material prediction of a tempered rolled steel sheet, particularly a high-tensile steel sheet having a TS of 780 MPa or more, adopts the rolling load of the temper rolling mill as an influencing factor is as follows. Conceivable.

  In general soft steel plates, because the steel plate is soft, the rolling load of the temper rolling mill and the equipment capacity of the tension have room for the soft steel plate, so either one of the rolling load or tension (for example, rolling) When the (load) fluctuates, the other one (for example, tension) can be controlled to make the elongation constant constant by rolling control of the temper rolling mill, and there is no significant difference even if only tension is used as an influencing factor.

  However, a high-tensile steel sheet having a TS of 780 MPa or more has a margin in equipment capacity for rolling load and tension of a temper rolling mill compared to the high-strength steel sheet, and is often operated at the limit of each equipment capacity. If either one of the rolling load or tension fluctuates, the other may not be able to absorb, and the prediction accuracy cannot be improved by using only one of the rolling load or tension. It is thought that it is necessary to predict the composite load from the elongation rate.

  In addition, as an influencing factor for predicting the material, the precision considering one or more of the temper rolling mill work roll diameter, the friction coefficient between the temper rolling mill work roll and the steel plate, and the temper rolling mill rolling speed are considered. It is also preferable to improve. When it is difficult to determine the temper rolling mill work roll diameter and the friction coefficient between the temper rolling mill work roll and the steel sheet, values determined or determined in advance may be used. The temper rolling mill rolling speed may be either the value on the entry side or the value on the exit side of the temper rolling mill.

  As shown in FIG. 7, it was confirmed that the YP predicted by this equation was in good agreement with the actual YP (multiple correlation coefficient 0.925). Further, since there is a strong correlation between YP and TS of the temper rolled steel sheet as shown in FIG. 8, TS is predicted using the relationship of TS = e * YP + f shown in FIG. When the relationship with the record TS is confirmed, it is as shown in FIG. 9, and it was confirmed that the material of the temper rolled steel sheet can be accurately predicted by the material prediction formula.

  As described above, the material prediction of the temper rolled steel sheet can be performed based on the elongation rate, tension, rolling load in the temper rolling mill 2, and the plate thickness and width of the steel sheet. Since the temper rolling mill 2 equipped with the divided backup rolls 9 is used, the value of the rolling load for each divided backup roll in the steel sheet width direction can be measured. Thereby, the above-mentioned formula is calculated for each divided backup roll, and material prediction in the steel plate width direction becomes possible.

  It should be noted that specific numerical values of a, b, c, d, e, and f and the form of the above formula may be the same or different for each divided backup roll. As is obvious to those skilled in the art, since the relationship between TS and YP also changes depending on the steel type, an expression corresponding to the steel type, for example, an expression using higher-order expressions or various functions may be used. It is not limited to the form. Further, a, b, c, d, e, and f in the above formula are determined by the characteristics of each line and the steel type, and are not particularly limited.

  In FIG. 2, the value of the rolling load in the steel sheet width direction was measured. As shown in FIG. 10, a large number of piezoelectric elements 15 were arranged in the body length direction of the tension meter roll 12, and the shape was detected by the magnitude of the contact pressure. If the tension distribution in the width direction is estimated from the shape information and the tension value and the tension per unit cross-sectional area are determined for each position of the divided backup roll 9, the material prediction in the latter half width direction can be performed more accurately. It becomes.

  In an example of the present invention, the rolling load, tension, and elongation rate in the steel sheet width direction continuously detected in the temper rolling mill 2, and the thickness gauge 13 and the sheet width gauge 14 located at the rear of the temper rolling mill 2. 1 is input to the process computer 16 shown in FIG. 1, and is substituted into the YP calculation formula and TS calculation formula of the tempered rolled steel sheet input to the process computer 16 and calculated. The material of the steel sheet currently being rolled can be grasped in real time. The values of the plate thickness and the plate width may be obtained from the vidicon 17 which is a host computer of the process computer 16.

  For this reason, when fluctuations occur in the calculated YP and TS of the temper rolled steel sheet, an alarm of occurrence of an abnormality can be immediately issued, and a large amount of off-standard products are not generated as in the prior art. In addition, even when the cause of the abnormality is a variation due to the previous process such as fluctuations in the steel plate component, it appears as a change in rolling load, tension, and elongation rate, so that the occurrence of the abnormality can be immediately grasped. The use of the temper rolling mill 2 as a material fluctuation monitor in this way is a novel technique that has never been seen before.

  Furthermore, in order to further improve the material prediction accuracy, the temper rolling is added with one or more of the temper rolling mill work roll diameter, the friction coefficient between the temper rolling mill work roll and the steel plate, and the temper rolling mill rolling speed. You may use the YP calculation formula and TS calculation formula of a rolled steel plate. The temper rolling mill work roll diameter and the friction coefficient value between the temper rolling mill work roll and the steel sheet are directly input to the process computer 9 by the operator or pre-input, and the temper rolling mill rolling speed is temper rolling. Rotation speed of the work roll or bridle roll installed before and after the temper rolling mill (not shown) is detected from the roll capable of detecting the rotational speed in or near the temper rolling mill and input to the process computer 16. That's fine.

  Next, FIG. 11 shows an embodiment in which the obtained width direction material predicted value is provided to a shipping destination user, utilized, and fed back to a steel plate manufacturer.

  In the present invention, a temper rolled steel sheet that is performed on the basis of rolling results in a temper rolling mill equipped with a backup roll divided into a plurality of steel sheets in the width direction arranged on the outlet side of a continuous annealing line or galvanizing equipment. Since the accurate predicted material value is used as the material value, it is possible to provide the user at the shipping destination with an arbitrary position or total length in the longitudinal direction of the material value in the width direction of the steel sheet. Here, the total length means that the material prediction is repeated in the longitudinal direction finely, so that the material is predicted and accumulated at intervals of 1 m or 10 cm, for example, according to the calculation function and the user's request.

  However, the amount of data becomes enormous when the full length in the longitudinal direction, for example, the full length for YP and the full length for TS, as well as the width direction for each material value. For this reason, it is preferable that the material prediction data is accumulated and organized using a computer, and is compressed by compression software as needed and provided to the shipping destination user via the network.

  The user of the steel plate shipping destination uses the material value in the width direction obtained via the network for rejecting a defective portion on the blanking line 20 by the user. At this time, it is more preferable to judge and reject the defective portion by using quality information such as surface defects. Even if the defective part is not rejected, the material value in the width direction obtained via the network by the user at the shipping destination of the steel plate can be used if the material can be pressed by adjusting the press conditions on the press line 21 by the user. Accordingly, if the pressing is performed by changing the pressing conditions such as the pressing load and the pressing load, it is possible to perform the pressing with a high yield while minimizing the generation of scrap.

  Since the feedback data to the steel plate manufacturer is expected to be enormous in some cases, it is preferable to feed back from the computer to the steel plate manufacturer via the network.

  More preferably, if the material condition when rejected as a material defect by the user at the shipping destination of the steel sheet or the material condition when the press condition is changed is fed back to the steel sheet manufacturer via the network, the steel sheet manufacturer It is possible to quickly investigate the cause and improve the material quality, and for subsequent shipping steel sheets, those with improved material values can be manufactured and shipped.

  For example, as shown in FIG. 11, user rejection, press condition change results and material values are fed back from the user to the steel plate manufacturer via the network server 22, and the steel plate manufacturer analyzes it to investigate the cause and consider countermeasures. Feedback improvement measures to the production line. The analysis of the feedback data in the steel plate manufacturer may be considered by dropping into individual personal computers via the network server 22, for example, or may be analyzed by the vidicon 17 or the process computer 16 of the steel plate manufacturer. The improvement measures based on the analysis result are fed back as operating conditions to the steel plate production line via the vidicon 17 or the process computer 16 of the steel plate manufacturer. There may be one or more steel plate production lines as feedback destinations.

  As described above, according to the present invention, it becomes possible to increase the productivity of both by sharing the width direction material information in the width direction of the steel plate over the entire length of the steel plate between the steel plate manufacturer and the user, especially from the automobile manufacturer. It has become possible to meet the demands for reducing material variations in high-tensile steel (high-strength steel plates).

It is a schematic diagram of a continuous annealing line. It is a perspective view which shows the width direction material prediction method. It is a graph which shows the correlation of rolling load and YP. It is a graph which shows the correlation between rolling tension and YP. It is a graph which shows the correlation with a rolling load and TS. It is a graph which shows the correlation between rolling tension and TS. It is a graph which shows the correlation with prediction YP and performance YP. It is a graph which shows the relationship between YP and TS. It is a graph which shows the correlation with prediction TS and track record TS. It is a perspective view which shows the other form of the width direction material prediction method. It is a schematic diagram which shows embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Continuous annealing furnace 2 Temper rolling mill 3 Temperature raising furnace 4 Soaking furnace 5 Cooling furnace 6 Quenching furnace 7 Dispensing reel 8 Take-up reel 9 Divided backup roll 10 Rolling load meter 11 Work roll 12 Tension meter roll 13 Plate thickness Total 14 Plate width meter 15 Piezoelectric element 16 Process computer 17 Vidicon 20 Blanking line 21 Press line 22 Network server

Claims (8)

  A temper rolling mill equipped with multiple backup rolls divided in the width direction of the steel sheet is placed on the exit side of the continuous annealing line or galvanizing equipment, and the width of the temper rolled steel sheet based on the rolling results in this temper rolling mill The material prediction of the direction of the material is performed, and the obtained material prediction result is provided to the user at the shipping destination of the steel plate via the host computer and the network. Material information provision method.   A temper rolling mill equipped with a backup roll divided into a plurality of strips in the width direction of the steel sheet is arranged on the exit side of the continuous annealing line or galvanizing equipment, and the elongation rate, tension, rolling load value in this temper rolling mill, Measure the thickness and width of the steel sheet or obtain it from a host computer, make a material prediction in the width direction of the tempered rolled steel sheet based on these values, and ship the steel sheet via the computer and network using the obtained material prediction results. The material information provision method of the shipping steel plate using the width direction material prediction method of the temper rolled steel plate according to claim 1, which is provided to a previous user. The elongation, tension and rolling load values, and the thickness and width of the steel sheet are continuously measured over the entire length of the steel sheet or obtained from a host computer, and based on these values, the material in the width direction of the temper rolled steel sheet 3. The method of predicting the width direction material of a temper rolled steel sheet according to claim 2 , wherein the prediction is performed over the entire length, and the obtained width direction material prediction result is provided to a user of the steel plate shipping destination via a computer and a network. How to provide material information on the used steel sheet. Predicting the material of the temper rolled steel sheet in the width direction using the prediction formula to calculate the yield point of the steel sheet from the values of elongation rate, tension, rolling load in the temper rolling mill and the thickness and width of the steel sheet. The material information provision method of the shipping steel plate using the width direction material prediction method of the temper rolled steel plate in any one of Claim 2 or 3 characterized by these. Shipment using the method of predicting the material in the width direction of a tempered rolled steel sheet, in which a user removes a defective material portion based on the material information obtained by the material information providing method according to any one of claims 2 to 4. How to use steel sheet material information. A width direction material prediction method for a temper rolled steel sheet, wherein a user changes a pressing condition of the steel sheet according to the width direction material information obtained by the material information providing method according to any one of claims 2 to 4. How to use material information of the shipping steel plate used.   6. The method for predicting the material in the width direction of a temper rolled steel sheet according to claim 5, wherein information on a material condition and a part of the steel sheet removed as a material defect by a user is fed back to a steel sheet manufacturer via a computer and a network. How to use material information of the shipping steel plate used.   The material direction in which the press condition of the steel sheet is changed by the user and the information on the part of the steel sheet are fed back to the steel plate manufacturer via a computer and a network. How to use material information of shipped steel plates using this method.

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